From 8a4c959798e190af6721d4dc180d56d0d343325f Mon Sep 17 00:00:00 2001
From: sjahl <636687+sjahl@users.noreply.github.com>
Date: Mon, 30 Oct 2023 17:57:03 -0400
Subject: [PATCH] Support mulpitle connection modes

---
 .../browser/base/api.deployment.yaml          | 12 +++---
 deploy/manifests/redis/redis-values.yaml      |  1 +
 graphql-api/src/cache.ts                      | 38 +++++++++++++------
 graphql-api/src/config.ts                     |  9 +++--
 graphql-api/src/graphql/rate-limiting.ts      | 20 +++++++---
 5 files changed, 53 insertions(+), 27 deletions(-)

diff --git a/deploy/manifests/browser/base/api.deployment.yaml b/deploy/manifests/browser/base/api.deployment.yaml
index f5d7d61fc..3f483d778 100644
--- a/deploy/manifests/browser/base/api.deployment.yaml
+++ b/deploy/manifests/browser/base/api.deployment.yaml
@@ -31,12 +31,12 @@ spec:
                 secretKeyRef:
                   name: gnomad-es-elastic-user # FIXME: This depends on using "gnomad" as the ES cluster name
                   key: elastic
-            - name: READ_CACHE_REDIS_URL
-              value: redis
-            - name: WRITE_CACHE_REDIS_URL
-              value: redis
-            - name: RATE_LIMITER_REDIS_URL
-              value: redis
+            - name: REDIS_HOST
+              value: 'redis'
+            - name: REDIS_PORT
+              value: '26379'
+            - name: REDIS_USE_SENTINEL
+              value: 'true'
             - name: TRUST_PROXY
               valueFrom:
                 configMapKeyRef:
diff --git a/deploy/manifests/redis/redis-values.yaml b/deploy/manifests/redis/redis-values.yaml
index 9b6e1692b..730991c5a 100644
--- a/deploy/manifests/redis/redis-values.yaml
+++ b/deploy/manifests/redis/redis-values.yaml
@@ -3,6 +3,7 @@ auth:
   enabled: false
 sentinel:
   enabled: true
+  masterSet: gnomad
   resources:
     requests:
       cpu: '500m'
diff --git a/graphql-api/src/cache.ts b/graphql-api/src/cache.ts
index 54e9864a3..be7fb2b64 100644
--- a/graphql-api/src/cache.ts
+++ b/graphql-api/src/cache.ts
@@ -9,19 +9,33 @@ let fetchCacheValue = () => Promise.resolve(null)
 let setCacheValue = () => Promise.resolve()
 let setCacheExpiration = () => Promise.resolve()
 
-if (config.READ_CACHE_REDIS_URL) {
-  const readCacheDb = new Redis({
-    sentinels: [{ host: config.READ_CACHE_REDIS_URL, port: 26379 }],
-    name: 'mymaster',
-    role: 'slave',
-    db: 1,
-  })
+if (config.REDIS_HOST) {
+  let readCacheDb
+  let writeCacheDb
+  if (config.REDIS_USE_SENTINEL) {
+    readCacheDb = new Redis({
+      sentinels: [{ host: config.REDIS_HOST, port: config.REDIS_PORT }],
+      name: config.REDIS_GROUP_NAME,
+      role: 'slave',
+      db: 1,
+    })
 
-  const writeCacheDb = new Redis({
-    sentinels: [{ host: config.WRITE_CACHE_REDIS_URL, port: 26379 }],
-    name: 'mymaster',
-    db: 1,
-  })
+    writeCacheDb = new Redis({
+      sentinels: [{ host: config.REDIS_HOST, port: config.REDIS_PORT }],
+      name: config.REDIS_GROUP_NAME,
+      db: 1,
+    })
+  } else {
+    readCacheDb = new Redis({
+      host: config.REDIS_HOST,
+      db: 1,
+    })
+
+    writeCacheDb = new Redis({
+      host: config.REDIS_HOST,
+      db: 1,
+    })
+  }
 
   const withTimeout = (fn: any, timeout: any) => {
     return (...args: any[]) =>
diff --git a/graphql-api/src/config.ts b/graphql-api/src/config.ts
index cae7f29ca..a42d11d4a 100644
--- a/graphql-api/src/config.ts
+++ b/graphql-api/src/config.ts
@@ -27,8 +27,10 @@ const config: Record<string, any> = {
   ELASTICSEARCH_QUEUE_TIMEOUT: JSON.parse(env.ELASTICSEARCH_QUEUE_TIMEOUT || '30') * 1000,
   ELASTICSEARCH_REQUEST_TIMEOUT: JSON.parse(env.ELASTICSEARCH_REQUEST_TIMEOUT || '60') * 1000,
   // Cache
-  READ_CACHE_REDIS_URL: env.READ_CACHE_REDIS_URL,
-  WRITE_CACHE_REDIS_URL: env.WRITE_CACHE_REDIS_URL,
+  REDIS_GROUP_NAME: env.REDIS_GROUP_NAME || 'gnomad',
+  REDIS_HOST: env.REDIS_HOST,
+  REDIS_PORT: JSON.parse(env.REDIS_PORT || '6379'),
+  REDIS_USE_SENTINEL: env.REDIS_USE_SENTINEL,
   CACHE_REQUEST_TIMEOUT: JSON.parse(env.CACHE_REQUEST_TIMEOUT || '15') * 1000,
   // Web server
   PORT: JSON.parse(env.PORT || '8000'),
@@ -39,10 +41,9 @@ const config: Record<string, any> = {
   MAX_QUERY_COST: JSON.parse(env.MAX_QUERY_COST || '25'),
   MAX_QUERY_COST_PER_MINUTE: JSON.parse(env.MAX_QUERY_COST_PER_MINUTE || '100'),
   MAX_REQUESTS_PER_MINUTE: JSON.parse(env.MAX_REQUESTS_PER_MINUTE || '30'),
-  RATE_LIMITER_REDIS_URL: env.RATE_LIMITER_REDIS_URL,
 }
 
-const requiredConfig = ['ELASTICSEARCH_URL', 'RATE_LIMITER_REDIS_URL']
+const requiredConfig = ['ELASTICSEARCH_URL']
 
 for (const setting of requiredConfig) {
   if (!config[setting]) {
diff --git a/graphql-api/src/graphql/rate-limiting.ts b/graphql-api/src/graphql/rate-limiting.ts
index 2881f83ab..de5c0e5a7 100644
--- a/graphql-api/src/graphql/rate-limiting.ts
+++ b/graphql-api/src/graphql/rate-limiting.ts
@@ -3,11 +3,21 @@ import config from '../config'
 import { UserVisibleError } from '../errors'
 import logger from '../logger'
 
-const rateLimitDb = new Redis({
-  sentinels: [{ host: config.RATE_LIMITER_REDIS_URL, port: 26379 }],
-  name: 'mymaster',
-  db: 2,
-})
+let rateLimitDb: Redis
+
+if (config.REDIS_USE_SENTINEL) {
+  rateLimitDb = new Redis({
+    sentinels: [{ host: config.REDIS_HOST, port: config.REDIS_PORT }],
+    name: config.REDIS_GROUP_NAME,
+    db: 2,
+  })
+} else {
+  rateLimitDb = new Redis({
+    host: config.REDIS_HOST,
+    port: config.REDIS_PORT,
+    db: 2,
+  })
+}
 
 const increaseRateLimitCounter = (key: any, value: any) => {
   return Promise.race([